Repair method and system for underground gas storage chamber microcracks in air compression energy storage power station

Abstract

The invention discloses a repairing method and system for underground gas storage chamber microcracks in an air compression energy storage power station, and the repairing method comprises the steps: S1, heating a water body to a preset temperature, adding salt into the water body for dissolving, and forming saturated salt water when the solubility of the salt is reached; s2, the saline water obtained in the step S1 is conveyed into the underground gas storage chamber until the underground gas storage chamber is filled with the saline water, so that the saline water intrudes into microfractures of the underground gas storage chamber; s3, after the saline water makes contact with the wall face of the underground gas storage chamber, the temperature of the saline water is gradually reduced, at the moment, the solubility of the salt is reduced along with reduction of the temperature, and salt particles are gradually separated out and adsorbed to the wall face of the underground gas storage chamber and the microcracks; s4, the temperature and pressure in the underground gas storage chamber are detected, and when the temperature and pressure are reduced to a stable value, the saline water is pumped out; and S5, the steps S1 to S4 are repeated until a salt shell is formed in the micro-crack, and plugging of the micro-crack is completed. Therefore, the problem of repairing the micro-cracks in the underground gas storage chamber is solved.

Description

Technical Field

[0001] The present application belongs to the field of engineering repair technology, and in particular, relates to a method and system for repairing micro-cracks in underground gas storage chambers in air compression energy storage power stations. Background Art

[0002] Compressed air energy storage power station technology has the advantages of large energy storage capacity, long energy storage cycle, short construction cycle, and small specific investment, and has broad development prospects. Using underground gas storage chambers such as salt caverns and artificial caverns to store air compression energy is the main way to store gas in compressed air energy storage power stations in the future. During the long-term energy storage process, underground gas storage chambers will produce microcracks (<10mm) under the action of high-frequency and high internal pressure cycles. Microcracks will affect the stability and air tightness of the chamber. How to repair microcracks in underground gas storage chambers is the key to the long-term operation of air compression energy storage power stations.

[0003] The existing underground space seepage channel detection and repair method (202410062586.8) requires that the optical fiber sensor device be inserted into the underground space channel to detect and determine the location of the crack channel, and then use magnetic mortar to repair it. However, the underground gas storage chamber used for air compression has a large space volume, and it is difficult for the optical fiber sensor to accurately determine the crack location. At the same time, the micro-cracks are small in size and it is difficult for the optical fiber sensor to extend into it. This solution is difficult to repair micro-cracks in the air compression energy storage underground gas storage chamber.

[0004] In the prior art, a comprehensive quantitative detection and repair process for underground structure surface cracks (202210099222.8) requires obtaining image data of the underground structure surface, extracting surface crack data, and then using grouting and other methods to repair the cracks. However, due to the large space of the underground gas storage chamber and the relatively small size of the microcracks, it is difficult to obtain accurate crack data, and this scheme is difficult to repair microcracks in the air compression energy storage underground gas storage chamber.

[0005] That is, the existing technologies: underground space seepage channel detection and repair method and a comprehensive quantitative detection and repair process for underground structure surface cracks both require obtaining the location of the crack channel and accurate crack data first, and then using grouting and other methods for repair. However, due to the large volume of underground gas storage chambers, it is difficult to accurately determine the location and data of all cracks, and it is difficult to repair micro cracks in air compression energy storage underground gas storage chambers. Summary of the invention

[0006] The purpose of this application is to overcome the problems of the prior art and disclose a method and system for repairing micro-cracks in underground gas storage chambers in air compression energy storage power stations, so as to solve the problem of repairing micro-cracks in underground gas storage chambers in air compression energy storage.

[0007] On the one hand, the purpose of this application is achieved through the following technical solutions:

[0008] A method for repairing micro-cracks in an underground gas storage chamber in an air compression energy storage power station, the method for repairing micro-cracks in an underground gas storage chamber comprising:

[0009] S1: Heat the water to a preset temperature, add salt to the water to dissolve it, and reach the solubility of the salt to form saturated brine;

[0010] S2: transporting the salt water obtained in step S1 to the underground gas storage chamber until it is full, so that the salt water intrudes into the micro cracks of the underground gas storage chamber;

[0011] S3: When the salt water contacts the wall of the underground gas storage chamber, the temperature of the salt water gradually decreases. At this time, the solubility of the salt decreases with the decrease in temperature, and the salt particles gradually precipitate and adsorb on the wall and micro-cracks of the underground gas storage chamber;

[0012] S4: Detect the temperature and pressure in the underground gas storage chamber, and when the temperature and pressure drop to a stable value, extract the brine;

[0013] S5: Repeat steps S1 to S4 until a salt crust is formed in the microcracks, thereby completing the plugging of the microcracks.

[0014] According to a preferred embodiment, the method further comprises:

[0015] S6: The air tightness of the underground gas storage chamber is tested. If the air tightness is qualified, the micro-crack repair is completed. If it is unqualified, repeat steps S1 to S5 until the air tightness is qualified and the micro-crack repair is completed.

[0016] According to a preferred embodiment, in step S6, steps S1 to S5 are repeated five to ten times to complete the microcrack repair.

[0017] According to a preferred embodiment, in step S1, the water body is heated to 100°C.

[0018] According to a preferred embodiment, in step S5, steps S1 to S4 are repeated five to ten times to form a salt crust.

[0019] On the other hand, the present application also discloses:

[0020] A repair system for micro cracks in underground gas storage chambers in air compression energy storage power stations, the repair system comprising: a heating water tank, a brine pipeline, a water pump and a temperature and pressure sensor,

[0021] The heating water tank is connected to the underground gas storage chamber via a salt water pipeline, and the water pump is arranged on the salt water pipeline;

[0022] The water is heated to a preset temperature by using a heating water tank, the salt is completely dissolved in the water, and the solubility of the salt is reached to form saturated brine;

[0023] The brine is transported to the underground gas storage chamber through the brine pipeline by a water pump until it is full, so that the brine intrudes into the micro cracks of the underground gas storage chamber;

[0024] When the salt water contacts the wall of the underground gas storage chamber, the temperature of the salt water gradually decreases. At this time, the solubility of the salt decreases with the decrease in temperature, and the salt particles gradually precipitate and adsorb on the wall and micro-cracks of the underground gas storage chamber.

[0025] The temperature and pressure in the underground gas storage chamber are detected by temperature and pressure sensors. When the temperature and pressure drop to a stable value, the brine is pumped out to the heating water tank.

[0026] Saturated brine is repeatedly injected into the underground gas storage chamber until a salt crust is formed in the micro-cracks, thus completing the sealing of the micro-cracks.

[0027] According to a preferred embodiment, the air tightness of the underground gas storage chamber is tested by a temperature and pressure sensor. If the air tightness is qualified, the microcrack repair is completed. If it is unqualified, saturated salt water is repeatedly input into the underground gas storage chamber until the air tightness is qualified and the microcrack repair is completed.

[0028] According to a preferred embodiment, the heating water tank heats the water to 100°C.

[0029] The aforementioned main scheme of the present application and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection in the present application. After understanding the scheme of the present application, those skilled in the art can understand that there are multiple combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present application, and they are not exhaustively listed here.

[0030] Beneficial effects of this application:

[0031] This application does not need to detect the exact location of microcracks in advance, and all microcracks in the underground chamber can be repaired by using the flow of salt water; this application does not need subsequent grouting, and uses the different solubility of salt at different temperatures to repair microcracks through the precipitation of salt particles. The technology is simple and highly operational. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the micro-crack repair process of the underground gas storage chamber of the present application;

[0033] Figure 2 This is a schematic diagram of the results of repairing micro cracks in the underground gas storage chamber of the present application;

[0034] Among them, 1-underground gas storage chamber, 2-micro cracks, 3-heating water tank, 4-brine pipeline, 5-water pump, 6-temperature and pressure sensor, 7-salt shell. DETAILED DESCRIPTION

[0035] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In addition, the present application would like to point out that, in the present application, unless the specific structure, connection relationship, positional relationship, power source relationship, etc. are specifically written out, the structure, connection relationship, positional relationship, power source relationship, etc. involved in the present application are all known by those skilled in the art on the basis of the prior art without creative work.

[0041] Example 1

[0042] refer to Figure 1 and Figure 2 As shown, the figure shows a method for repairing microcracks 2 in an underground gas storage chamber 1 in an air compression energy storage power station, and the method for repairing microcracks 2 in the underground gas storage chamber 1 includes the following steps.

[0043] Step S1: Heat the water to a preset temperature, add salt to the water to dissolve it, and reach the solubility of the salt to form saturated brine.

[0044] Preferably, in step S1, the water is heated to 100° C. When the water temperature is 100° C., the salt solubility is the highest.

[0045] Step S2: The salt water obtained in step S1 is transported to the underground gas storage chamber 1 until it is full. Due to the fluidity of the liquid, the salt water intrudes into the micro cracks 2 of the underground gas storage chamber 1.

[0046] Step S3: The wall temperature of the underground gas storage chamber is relatively low. When the brine contacts the wall of the underground gas storage chamber 1, the temperature of the brine gradually decreases. At this time, the solubility of the salt decreases with the decrease in temperature, and the salt particles gradually precipitate and are adsorbed on the wall of the underground gas storage chamber 1 and the microcracks 2.

[0047] Step S4: Detect the temperature and pressure in the underground gas storage chamber 1, and when the temperature and pressure drop to a stable value, extract the brine.

[0048] Step S5: repeating steps S1 to S4 until a salt crust 7 is formed in the microcracks 2, thus completing the plugging of the microcracks 2.

[0049] Preferably, in step S5 , steps S1 to S4 are repeated five to ten times to form a salt crust 7 .

[0050] Step S6: The air tightness of the underground gas storage chamber 1 is tested. If the air tightness is qualified, the microcracks 2 are repaired. If not, steps S1 to S5 are repeated until the air tightness is qualified and the microcracks 2 are repaired.

[0051] Preferably, in step S6, steps S1 to S5 are repeated five to ten times to complete the repair of the microcracks 2.

[0052] This application does not need to detect the exact location of microcracks in advance, and all microcracks in the underground chamber can be repaired by using the flow of salt water; this application does not need subsequent grouting, and uses the different solubility of salt at different temperatures to repair microcracks through the precipitation of salt particles. The technology is simple and highly operational.

[0053] Example 2

[0054] Based on Example 1, this example further discloses: a repair system for microcracks 2 in an underground gas storage chamber 1 in an air compression energy storage power station, the repair system comprising: a heating water tank 3, a brine pipeline 4, a water pump 5 and a temperature and pressure sensor 6, the heating water tank 3 is connected to the underground gas storage chamber 1 via the brine pipeline 4, and the water pump 5 is arranged on the brine pipeline 4.

[0055] The water is heated to a preset temperature by the heating water tank 3, the salt is completely dissolved in the water, and the solubility of the salt is reached to form saturated brine. Preferably, the heating water tank 3 heats the water to 100°C.

[0056] The brine is transported to the underground gas storage chamber 1 through the brine pipeline 4 by a water pump 5 until the underground gas storage chamber 1 is filled, so that the brine intrudes into the micro cracks 2 of the underground gas storage chamber 1 .

[0057] When the brine contacts the wall of the underground gas storage chamber 1 , the temperature of the brine gradually decreases. At this time, the solubility of the salt decreases with the decrease in temperature, and the salt particles gradually precipitate and are adsorbed on the wall of the underground gas storage chamber 1 and the microcracks 2 .

[0058] The temperature and pressure in the underground gas storage chamber 1 are detected by the temperature and pressure sensor 6. When the temperature and pressure drop to a stable value, the brine is pumped into the heating water tank 3.

[0059] Saturated salt water is repeatedly introduced into the underground gas storage chamber 1 until a salt crust 7 is formed in the microcracks 2, thereby completing the plugging of the microcracks 2.

[0060] The air tightness of the underground gas storage chamber 1 is tested by the temperature and pressure sensor 6. If the air tightness is qualified, the microcracks 2 are repaired. If not, saturated salt water is repeatedly input into the underground gas storage chamber 1 until the air tightness is qualified and the microcracks 2 are repaired.

[0061] This application does not need to detect the exact location of microcracks in advance, and all microcracks in the underground chamber can be repaired by using the flow of salt water; this application does not need subsequent grouting, and uses the different solubility of salt at different temperatures to repair microcracks through the precipitation of salt particles. The technology is simple and highly operational.

[0062] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for repairing micro cracks in underground gas storage chambers in air compression energy storage power stations, characterized in that: The method for repairing microcracks in the underground gas storage chamber comprises: S1: Heat the water to a preset temperature, add salt to the water to dissolve it, and reach the solubility of the salt to form saturated brine; S2: transporting the salt water obtained in step S1 to the underground gas storage chamber until it is full, so that the salt water intrudes into the micro cracks of the underground gas storage chamber; S3: When the salt water contacts the wall of the underground gas storage chamber, the temperature of the salt water gradually decreases. At this time, the solubility of the salt decreases with the decrease in temperature, and the salt particles gradually precipitate and adsorb on the wall and micro-cracks of the underground gas storage chamber; S4: Detect the temperature and pressure in the underground gas storage chamber, and when the temperature and pressure drop to a stable value, extract the brine; S5: Repeat steps S1 to S4 until a salt crust is formed in the microcracks, thereby completing the plugging of the microcracks.

2. The method for repairing microcracks in an underground gas storage chamber according to claim 1, characterized in that: The method further comprises: S6: The air tightness of the underground gas storage chamber is tested. If the air tightness is qualified, the micro-crack repair is completed. If it is unqualified, repeat steps S1 to S5 until the air tightness is qualified and the micro-crack repair is completed.

3. The method for repairing microcracks in an underground gas storage chamber according to claim 2, characterized in that: In step S6, steps S1 to S5 are repeated five to ten times to complete the microcrack repair.

4. The method for repairing microcracks in an underground gas storage chamber according to claim 1, characterized in that: In step S1, water is heated to 100°C.

5. The method for repairing microcracks in an underground gas storage chamber according to claim 1, characterized in that: In step S5, steps S1 to S4 are repeated five to ten times to form a salt crust.

6. A repair system for micro cracks in underground gas storage chambers in air compression energy storage power stations, characterized in that: The repair system comprises: a heating water tank (3), a salt water pipeline (4), a water pump (5) and a temperature and pressure sensor (6). The heating water tank (3) is connected to the underground gas storage chamber (1) via a salt water pipeline (4), and the water pump (5) is arranged on the salt water pipeline (4); Using a heating water tank (3) to heat water to a preset temperature, the salt is completely dissolved in the water, and the solubility of the salt is reached to form saturated brine; Using a water pump (5) to transport salt water through a salt water pipeline (4) to the underground gas storage chamber (1) until it is full, so that the salt water intrudes into the micro cracks (2) of the underground gas storage chamber (1); When the salt water contacts the wall of the underground gas storage chamber (1), the temperature of the salt water gradually decreases. At this time, the solubility of the salt decreases with the decrease in temperature, and the salt particles gradually precipitate and are adsorbed on the wall of the underground gas storage chamber (1) and the microcracks (2); The temperature and pressure in the underground gas storage chamber (1) are detected by a temperature and pressure sensor (6), and when the temperature and pressure drop to a stable value, the salt water is pumped out into a heating water tank (3); Saturated salt water is repeatedly introduced into the underground gas storage chamber (1) until a salt crust (7) is formed in the microcracks (2), thereby completing the plugging of the microcracks (2).

7. The underground gas storage chamber micro-crack repair system according to claim 6, characterized in that: The air tightness of the underground gas storage chamber (1) is tested by a temperature and pressure sensor (6). If the air tightness is qualified, the micro-crack repair is completed. If it is unqualified, saturated salt water is repeatedly input into the underground gas storage chamber (1) until the air tightness is qualified, and the micro-crack (2) is repaired.

8. The underground gas storage chamber micro-crack repair system according to claim 6, characterized in that: The heating water tank (3) heats the water to 100°C.

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